How many years does it take to bring together the stars of opera, rock ‘n’ roll, Broadway, country and classical music? 15 years exactly. This May 12th, the 170-year-old Mormon Tabernacle Choir will release its album, “Mormon Tabernacle Choir and Friends.” The group dubbed “America’s Choir” features stars of classical music such as; Renée Fleming, Bryn Terfel, and Yo-Yo Ma. Broadway {…}